Betabdeb



E. E. ROLL.

RETARDER.

APPLICATION FILED APR.2|. 1915.

1 ,308,644. Patented July 1, 1919.

76 ,Exhaust 732 .fla 2h; 40M

UNITED sTATEs PATENT oEEicE.

EDWARD E. ROLL, or CLEVELAND, omo.

' RETARDER.

To all lwhom it may concern Be it known that I, EnwAiin E. Rom., a

citizen of the United States, residing at v Cleveland, in the county of Cuyahoga and State of ()liio,.have invented a certain new and useful Improvement in Retaiders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to a process whereby what is known to the trade as retarder may be produced, the object of the invention being to provide a process whereby a stronger and more uniform )rodiict may be produced than is obtainable by ordinary methods; also to provide a process whereby the by-products may be recovered and saved, with the result that the expense of running the apparatus and of producing the retarder may largely, if not entirely, be paid for by such ley-products. A still further object of the invention is to produce a process whereby the production of the product may be carried on continuously.

The retarder referred to hereinbefore con-- sists generally of a ground mixture of thin water-slaked lime and a ghiey mass that. is obtained by dissolving cattle hair in a mixture of water-slaked lime and soda ash. By this treatment of the hair with the mixture' of water-slaked lime and vsoda ash, the

'hair is dissolved, with production of the `luey mass referred to; more water-slaked lime is then added -to and mixed with the luey mass; the composition thus produced 1s dried and ground to a powder, and this powder is known to the trade as retardeix By my process it is possible to use practically any of the animal or vegetable byproducts that are ordinarilv used for the manufacture of glues, and the treatment of these by-prodiicts, leading up to the production of the retarder, is shown in the drawing forming part hereof wherein the figure shows, partly in elevation and partly in section, a somewhat diagrammatic view of the v ap aratus for carrying out my process.

n said drawing, 1 represents one o f apair of beams or sills which are adapted to spport therebetween a digester and a mixing or com oundinfr tank. 2 denotes the digester, t e sameoeing shown as a cylindrical vessel provided with a frusto-conical lower end and having a suitable filling opening provided with a man-hole cover 3. I4 denotes a large discharge outlet pipe leading Specification of Letters Patent. r

Patented July 1., 1919.

Application filed April 21, 1915. Serial No. 22,757.

ordinary gate valve having an operating i handle 8. From this gate valve there extends a pipe section 9 whereby the material discharged through the ga-te valve may pass onto a screen 10 in the upper end of 'a tank 11. -From the upper end of this tank there extends a pipe 12, connected with a suitable exhaust fan and serif'ing'to conduct the ammonia, generated by the chemical reactions within the various parts of the apparatus, to a suitable collector (not shown). 13 denotes a pipe whereby steam may be introduced into the bottom of the digester, as through the outlet connection 4, thereby-to agitate the batch in the digester and Aprevent the same from clogging, thus avoiding the necessity for a stirring rod.

Freni the bottom of the tank 11 a pipe l-i leads to a pump 15 whereby the gluey liquid collected in said tank is supplied to the top of the compounding or mixing tank 16. This tank is provided with a filling opening having a man-hole cover-17 and with air axial shaft 18 provided with stirring paddles 19, the shaft 18 beine' driven by means of the gears 20 and 21, tie shaft 22, pulley 23 and belt 24. In the tank 16, the lliquid is compounded or mixed with a suitable quan- 'tity of hydrated lime. y This results in releasing ammonia, which may be led to the,

watery mixture is produced, and this watery mixture may be further agitated in the tank 28. The ammonia produced in the tank 28 will be led off through a pipe 36 into the vertical pipe 37 connected with the ipe 12.

The pipe 25 may also connect with t iis vertical pipe.

The watery mixture is led from the botl tom ofthe storage tank through a pipe 38 into troughs 39 extendin alongside a air of steam-heated drying ro ls 40, the ro ls revolving in the direction of the arrows,

whereby the thin coating on-each rll will be carried entirely around and dried 1n transit,

ythe dried material `being scraped' off by the sharp bottom edges of the troughs. T he material which is removed by the scraping action of the troughs drops upon an endless conveyer 41 which discharges onto a bucket elevator 42, which in turn discharges into a chute 43, the lower end whereof deposits the material within aninclined drying cylinder 44. From the discharge end of this 'cylinder the completely dried. material is delivered into a cooler, which may be a water cooled conveyer of the worm-conveyer type. The

one shown herein comprises a worm conveyer 45 within a U-shaped trough 46, which trough may be double walled,\whereby water may be circulated through the trough thereby to' cool the powdered retarder carrled therealong by the action of the worm. The powdered material from the cylinder 44 1s 'conducted to one end of the trough andy worm by means of a chute 47. The cooling of the product is necessary because of the hygoscopic condition of the same. The use of hydrated lime in making the compound largely remedies the hygroscopic condition which has heretofore interfered with the uniformity in the. character of the product. y

The liquid supplied from the pipe 38 may be distributed to the troughs v89 by means of a transverse troughBShaving tubes 381 arranged to discharge into the troughs 39. As more ammoniawill be liberated during this drying step, a hood 48 is provided above the rolls, and from this hood thereextends a pipe 49 which is shown as connected with the pipe 37 and thus, in turn, with the pipe 12. y With the apparatus constructed as de- 'under approximately 90 pounds pressure and should not materially ex-ceed such pressure. The Steam being retained within the jacket at the pressure mentioned, the ammonia releasedl from the decomposition of the glueproducing matter will escape through the pipe 50 andthe pressure-release valve 51 into the ammonia main 12. After the pressure within the digester reaches to 90 pounds, the steam supply to the jacket 5 may be shut oi and the materials retained therein for To these ingredients, 1 addA three or four hours.' Where the pipe 13 is connected to the bottom of the digester above the gate valve, steam may be turned on to the bottom of the digester before dumping the contents thereof in order to prevent clogging and to avoid the necessity for a stirring rod. The contents having been deposited upon the screen 10, the waste products are`retained by such screen and only the retard'ing liquid collects in the receiving tank. From this tank the liquid is pumped into the mixing or compounding tank 16 where it is-mixcd with about 150() pounds of hydrated lime, lthe mixture produced being of a thin, watery consistency. The addition of this lime'to the retarding liquid results in producing ammonia, that may 'be piped olf to a condenser, as explained hereinbefore. From the mixing or compounding tank, the mixture is dumped into the storage tank 28, Where it may be further agitated and mixed and any ammonia that may be present will bev conducted away through the pipe 36.' The liquid mixture is conducted from the storage tank by the pipe 38 to the troughs 39. One end of each of these troughs is closed, asindicated at 39a, whereby any liquid in excess of that which can be taken up by the rolls 40 may flowthe length of thetrough along each roll and overflowinto the transverse trough 52, thereby to be conducted through a tank 53, pump 54 and pipe 55 back intothe storage tank 28. The material which is dried upon the outer surfaces of the rolls 40 is scraped therefrom Aby the lower edges of the troughs 39 and falls upon the endless conveyer 41 which in turn delivers it to the bucket conveyer 42. Thence the material is delivered into the drying cylinder 44, which may be heated in any approved manner (as by the viiurnace'the lire box whereof is indicated at 44a) and the thoroughly dried and hot retarder powder is then delivered to the worm conveyer where it is finally cooled, placing it in condition'for grinding without the absorption of moisture, after which it may be ground in any approved type of grinding machine.

In describing that part of the process which is carried on in the tank 16, I havefer to introduce lime inthe hydrated condition into the tank 16 and to employ a dilute or watery solution of-lime. However, it should be understood that Imay introduce air slaked lime `into the tank 16, mix this lime with the gluey liquid in said tank, and subsequently add to this mixture a sufficient quantity of water to produce a liquid of the desired consistency in said tank. The same' is true as4 to the part of the process which is carried on in the digester; instead of adding hydrated lime directly to the digester, I may introduce slaked lime thereinto referred to the use of hydrated lime. I preinode/ie Le?,

and at seine subsequent stage add sufficient water to produce a liquid of the desired consistency. it `will be understood that. the term hydrated lime which appears in the claims annexed hereto is intended to include alike the original solution of lime or the 'solution or mixture that is produced subsequently/.by adding water to the digester or the inixingtank.

Having thus described my invention, what l claim is:

` the same, cooling the mixture thus produced,

animal matter, alkali, and

and inally grinding the saine.

2. The process of producing a retarder' which consists in heating animal matter, alkali, and hydrated lime in about the proportions speciiied to produce therefrom a gluey liquid, mixing the resultant liquid with hydrated lime in about the proportions specied, evaporating the mixture, and inall grinding the resultant solid.

3. he process of producing a retarder which consists in heating a mixture of lueroducing matter, alkali, and hydrated ime in about the proportions specified under a pressure of from 70 to 90 pounds thereby to produce a gluey liquid, separating the liquid from the mass, mixing such liquid with hydrated lime in about the proportions speciiied to produce a watery liquid, evaporating such liquid by the application of heat thereto, and cooling and grinding the resultant solid matter.

e. The process of producing a retarder which consists in heatin y a. mixture of about the proportions specified under a pressure ci from 70 to" 90 pounds thereby to produce a gluey liquid, separating the liquid from the mass, mixing such liquid with hydrated lime in about the proportions speciiiedlto produce a watery liquid, eva orating such liquid, and cooling and grin ing the resultant solid matter..

5. The process of producing a retarder which consists in subjecting a mixture ofdrated lime in gluereducing matter, alkali, and hydrated lime in a digester to the heat of an externally applied heating agent until the pressure Within the digester reaches approximately 70 to 90 pounds; then cutting o the supply of the heating agent and allowinfrl the mass to stand for several hours then withdrawing from the mass the liquid thus formed; mixing said liquid with hydrated lime in about the proportions speciied to produce' a liquid Amixture of watery consistency; evaporating said liquid, and cooling and grinding the solid thus produced.

6. rThe process of producing a retarder which consists in subjecting a mixture of animal matter, alkali and hydrated lime in a digester to the heat of an externally applied heating agent until the pressure within the digester reaches approximately 70 to 90 pounds; then cutting ofi the heating agent and allowing the mass to stand for several hours; then withdrawing from the mass the liquid thus formed; mixing said liquid with 'hydrated lime in about the proportions specified to produce a liquid mixture of watery consistency; evaporatin said liquid, and inding the solidthus pro uced.

7. he process of roducing a retarder which consists in heatin matter capable of producing a gluey liqui alkali, and lime in about the proportions specified to produce therefrom a glue liquid, mixing such liquid with lime in about the proportions specified, and heating the mixture thus pro-- duced -in order to dry the same and to recover the resultant solid retarder compound. 8. The? process of producing a retarder which consists in heatin matter capable of' producing a luey liqui in the presenceof an alkali, sla red lime and water in the proortions to produce a gluey liquid thereom, mixing such liquid with slaked lime and water in about the proportions specified, and heating the mixture thereby to expel the moisture and leave the gluey liquid in combination with the slaked lime.V

In testimony whereof, I hereunto afiix my signature in the presence of two witnesses.

EDWARD E. ROLL. Witnesses:

J. B HULL BRENNAN WEST. 

